IS - 3rd Gen (2014-present) Discussion about the 2014+ model IS models

Worst fuel economy after installing F Sport Exhaust?

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Old 01-26-16, 07:10 AM
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A2BLexus
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Thanks for the input. I haven't stop driving my car. I've just made an observation that the car seems to be a lot less efficient after I installed the exhaust and wondering if others have experienced it.

Don't think my observations between fuel economy and exhaust change is totally unrelated. If it is so silly to you, there is always the "back" button or just don't reply.
Old 01-26-16, 08:08 AM
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dnasians
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Originally Posted by specONE
i think what may be happening is you are stepping on gas harder to heard the sound but drawback to this is you using more gas. lol
Could be though.
i wanted to write this!
Old 01-26-16, 08:48 AM
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Swacer
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Originally Posted by A2BLexus
Thanks for the input. I haven't stop driving my car. I've just made an observation that the car seems to be a lot less efficient after I installed the exhaust and wondering if others have experienced it.

Don't think my observations between fuel economy and exhaust change is totally unrelated. If it is so silly to you, there is always the "back" button or just don't reply.
Don't' misunderstand my sarcasm as attitude. This world has far too many people who are offended by everything, please don't be one of those people.

When I say silly, I am meaning to say that this is not a concern and you shouldn't waste anymore of your efforts being worried about it.
Old 01-26-16, 09:15 AM
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pillbox
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Originally Posted by A2BLexus
Sorry for the conversion issues. I will just reference it based on liters.



LOL I wish that was the case. The car just needs a slightly heavier foot to get going now but by no means and I flooring it.


Based on my current tank of gas, I will get about 460 km. Current L per 100 km is 13.7. I don't idle my car at all.

The fuel economy is especially bad when my car has been sitting for a while. For the first 5 mins, the fuel consumption bars are maxed no matter what speed I am driving at (usually around 50 kph since I am getting out of a residential area) .

The fuel economy gets better once the car is fully warmed up which wasn't the case prior to the exhaust install.
For reference, I get roughly 630-650 km per tank.
I don't idle to warm up.
I drive like a granny until engine and trans are warmed up.
I run my car through second and third once a day to blow off the carbon deposits.
I've got 45k km on my odometer.
I drive about 60 city/40 highway.
Old 01-26-16, 09:49 AM
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goldengame
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I've found that my mileage gets worse in the winter. It's probably a combination of the winter tires, colder air, and idling a little longer to warm up.

My average city fuel economy was around 12L/100km in the summer and closer to 13L/100km in the winter. My average combined fuel economy is about 10L/100km in summer and 10.8L/100km in winter doing 65/35 highway/city.
Old 01-26-16, 09:57 AM
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A2BLexus
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Thanks for the reference.

I don't warm up during idle
I don't gas up quickly until the car is warm
I don't don't run my car through 2nd &3rd, should start, sounds fun. LOL
I think my car is at about 38kms
my driving is probably 80 city/20 highway

Last winter before the exhaust, I was averaging around 600 km per tank. 460 km just seems crazy low. Will keep an eye out for the next tank and go from there.
Old 01-26-16, 10:00 AM
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A2BLexus
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Originally Posted by Swacer
Don't' misunderstand my sarcasm as attitude. This world has far too many people who are offended by everything, please don't be one of those people.

When I say silly, I am meaning to say that this is not a concern and you shouldn't waste anymore of your efforts being worried about it.
Not offended. Just soliciting experiences from fellow IS250 drivers to see if my situation is normal. Don't have time to get offended in an internet forum.
Old 01-26-16, 10:01 AM
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A2BLexus
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Originally Posted by goldengame
I've found that my mileage gets worse in the winter. It's probably a combination of the winter tires, colder air, and idling a little longer to warm up.

My average city fuel economy was around 12L/100km in the summer and closer to 13L/100km in the winter. My average combined fuel economy is about 10L/100km in summer and 10.8L/100km in winter doing 65/35 highway/city.

Sounds pretty normal. How many kms do you get per tank?
Old 01-26-16, 10:18 AM
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Originally Posted by A2BLexus
Sounds pretty normal. How many kms do you get per tank?
I usually fill up around half tank. On average I get a little over 300 km to half a tank. So it's in line with what other people in this thread said. I have the default exhaust though, not the F-Sport.
Old 01-26-16, 10:49 AM
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My isf doesn't give me anything less than 12 mpg city and I drive hard on it.
Old 01-26-16, 01:48 PM
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For just city driving 500km is quite good for me. A V6 is thirsty in the city...if my highway amount would be higher i easierly get 600+ km.
Old 01-26-16, 05:44 PM
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My0gr81
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Originally Posted by A2BLexus
Thanks for the reference.

I don't warm up during idle
I don't gas up quickly until the car is warm
I don't don't run my car through 2nd &3rd, should start, sounds fun. LOL
I think my car is at about 38kms
my driving is probably 80 city/20 highway

Last winter before the exhaust, I was averaging around 600 km per tank. 460 km just seems crazy low. Will keep an eye out for the next tank and go from there.
For what's it's worth, I went from 600 to about 525 a tank once the winter tires, winter gas and cold weather set in. Cruising for a bruising starting next week as trade in for the IS300
Old 01-26-16, 11:15 PM
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Originally Posted by Swacer
"winter gas" does not burn faster, the cold air is more dense, which requires more fuel to keep your A:F ratio constant.
That is partially a factor but the winter blend has more butane in it, which makes the fuel burn faster, or should I say... evaporates faster.

Check the links below:
https://blog.gasbuddy.com/posts/Wint...22955-413.aspx
http://auto.howstuffworks.com/fuel-e...mmer-fuel1.htm

Last edited by Sango; 01-27-16 at 02:26 AM.
Old 01-26-16, 11:40 PM
  #29  
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Originally Posted by Slplknight
I am from Germany and wie use the metric system. Just like my fellow Canadians
Yep. We Canadians are metric.

I still wonder why US, Liberia and Burma still have not converted the metric system yet.
Old 01-27-16, 04:10 AM
  #30  
Swacer
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Originally Posted by Sango
Yep. We Canadians are metric.

I still wonder why US, Liberia and Burma still have not converted the metric system yet.
Many of us wish we went to metric, but 'murica!

Heck, there are so many in this country that barely understand imperial units....

One can only hope after this oldest generation dies off, an integration into metric can begin.

Another case in point, a transition to metric would be a great topic to bring up during a presidential debate! BUT, we have to continue talking about deporting Mexicans....ugh

Either way......


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